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ESP8266 CPU frequency, AWS IOT connection time

Is the CPU frequency set to 80MHz or 160MHz. Is there any build_var to select this?

I am connecting to AWS IOT with the TLS certificates and it takes about 25s to connect and update the shadow. I was hoping that increasing the CPU frequency will reduce the connection time. Is there anything else I can do reduce the connection time? Will using the ATECC508A crypto chip affect the connection time?

yes, software crypto used during handshake is very slow on esp8266. if ecc508 is used, all the expensive crypto is off-loaded to the chip and as Sergey said, handshake will take about a second. total connection time also also includes a couple seconds for wifi.